package com.heima.gateway.filter;

import com.heima.gateway.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.net.URI;

/*
全局过滤器，校验token是否有效
 */
@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {
    /**
     * 执行过滤的方法
     * @param exchange 交换机，可以获取请求和响应对象
     * @param chain 过滤器链
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //2.获取请求路径
        URI uri = request.getURI();
        //3.判断是否可以放行(是否是登录路径)
        if(request.getURI().getPath().contains("/login/login_auth")){
            //放行
            return chain.filter(exchange);
        }
        //4.获取token
        String token = request.getHeaders().getFirst("Token");
        if(StringUtils.isEmpty(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //5.解析token
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            Integer id =(Integer) claimsBody.get("id");
            request.mutate().header("user-info",id.toString());
            //是否是过期
            int result = AppJwtUtil.verifyToken(claimsBody);
            if(result == 1 || result  == 2){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return chain.filter(exchange);

    }

    /**
     * 过滤的执行的优先级，返回值越小优先级越高
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
